HVAC Ductulator Calculator

HVAC Ductulator Calculator is built to work on your device. It has no accounts and no ads, and it does not track you across apps or websites.

Data you enter

Everything you create in the app is stored only on your device. We cannot see it. Deleting the app deletes it.

Data we collect

We collect a small amount of data that is not linked to your identity:

Crash reports (via Sentry): technical details when the app crashes, used to fix bugs.
Usage analytics (via PostHog): anonymous events such as screens viewed, used to improve the app.
Purchase history (via RevenueCat and Apple): whether you have bought the premium features, used to unlock them.

We do not sell data, share it with data brokers, or use it for advertising.

Purchases

Premium features are a one-time in-app purchase, not a subscription. Payments are handled by Apple and we never see your payment details. Restore the purchase on any device signed in to the same Apple ID.

Children

The app is not directed at children under 13 and does not knowingly collect their data.

Contact

Questions or deletion requests: ductulator@curiouscrane.dev.

Last updated 2026-11-02.